BSNL
Wireless Internet Speed is very slow

I have purchased the NIC device from BSNL to have the facility of wireless internet.

But in my place that is Chainpal, in Talcher the signal strength for internet is very low.

So, the pages are expiring before opening.

I went to the office the next day I purchased the device for Rs.3438.00 to return or replace or convert my wireless to broadband scheme, but they did not listen.

Even they told that once you purchased it, means its yours, there is no warranty provided for this device.

Now, I don't have any other option, I am using the internet in a very slow rate where as the maximum utilizable capacity of the internet in wirless form provided by bsnl is around 230.4 kbps.

What should I do?